Cathode Ray Tube Experiment and Charge To Mass Ratio of an Electron

Рет қаралды 175,099

4 жыл бұрын

This chemistry and physics video tutorial provides a basic introduction into the cathode ray tube experiment. JJ Thompson used this experiment to conclude that all atoms contain negatively charged particles known as electrons. Using this experiment, he was able to calculate the charge to mass ratio of an electron.
Chemistry - Basic Introduction:
• Chemistry
Scientific Notation Review:
• Scientific Notation - ...
Significant Figures Review:
• Significant Figures - ...
Unit Conversion Problems:
• Converting Units With ...
Accuracy and Precision:
• Accuracy and Precision
Density Practice Problems:
• Density Practice Problems
________________________________
Pure Substances & Mixtures:
• Pure Substances and Mi...
Homogeneous & Heterogeneous Mixtures:
• Homogeneous and Hetero...
Physical and Chemical Changes:
• Physical and Chemical ...
Solids, Liquids, Gases, & Plasma:
• States of Matter - Sol...
Physical Vs Chemical Properties:
• Physical vs Chemical P...
__________________________________
Law of Conservation of Mass:
• Law of Conservation of...
Law of Definite Proportions:
• Law of Definite Propor...
Law of Multiple Proportions:
• Law of Multiple Propor...
Rutherford's Gold Foil Experiment:
• Rutherford's Gold Foil...
Cathode Ray Tube Experiment:
• Cathode Ray Tube Exper...
_________________________________
Atoms - Basic Introduction:
• Atoms - Basic Introduc...
Cations and Anions Explained:
• Cations and Anions Exp...
Diatomic Elements & Molecules:
• Diatomic Elements & Mo...
Elements, Atoms, & Molecules:
• Elements, Atoms, Molec...
Protons, Neutrons, & Electrons:
• How To Calculate The N...
_______________________________
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www.video-tutor.net/
Full-Length Videos and Worksheets:
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Пікірлер: 129

@TheOrganicChemistryTutor 5 ай бұрын

Final Exams and Video Playlists: www.video-tutor.net/ Full-Length Math & Science Videos: www.patreon.com/mathsciencetutor/collections

@niroshanaperera7330 3 жыл бұрын

3 boring hours of brain-melt from my teacher, condensed into 18 interesting minutes of knowledge. Thank you so much.

@nijamuddinsarker9139 4 жыл бұрын

I wish to meet u one day brother...

@lacquishalakk5859 Жыл бұрын

Mee toooooooooo

@nickkal6397 Жыл бұрын

Please forgive him bro

@varunsathya1912 Жыл бұрын

This sounds like a threat

@wonderman8537 Жыл бұрын

@@varunsathya1912 note he called him a brother

@Cole2D 9 ай бұрын

I am him😂

@m.fatihturkoglu1848 3 жыл бұрын

Why is this so simple when you are explaning it man omg like every one of your videos like that i love youuuu

@farahrasheed1536 4 жыл бұрын

dude what a coincidence I took this today at school and I didn't understand anything but now it looks easy for me thank you so much

@manarahmed4952 4 жыл бұрын

Saame!

@aizadzulqarnaen6655 4 жыл бұрын

I got online class about this last week and tbh i don't even remember a thing

@lililili8411 2 жыл бұрын

Thanks for giving such clear explanations on the calcus !

@sciencenerd7639 2 жыл бұрын

Finally, a video that gives a complete explanation of this experiment! Thanks.

@saadextremist8104 Жыл бұрын

Brother you helped me immensely with this. I was so troubled, my textbook showed the e/m value without even a hint about how it came to be.

@georgesadler7830 6 ай бұрын

Professor Organic Chemistry Tutor, thank you for a solid analysis of the classical Cathode Ray Tube Experiment and the Charge to Mass Ratio of an Electron in AP/General Chemistry. The Cathode Ray Tube Experiment is a well-known experiment in Science and Engineering. This is error free video/lecture on KZfaq TV with the Organic Chemistry Tutor.

@Aminhelal210 2 жыл бұрын

You made me actually love science I am so grateful

@markle3303 Жыл бұрын

my chem teacher explained this to me for a whole 75 minutes class and I didn't understand anything. You explained it in just a few minutes and I finally got it, you are my chem savior!!

@tracymokeira9528 3 ай бұрын

Wait which country are you from? Because in our country this is under physics subject

@LauraBenezia-XIIPA 2 жыл бұрын

Thank you very much, this video really helped me for facing my exam

@evabunnik9635 3 жыл бұрын

This has been so helpful thank you!!!!!

@araatasunts5366 4 жыл бұрын

At least ! The best video about the kathod ray experiment ! The author is awsome !!!

@deceit0223 10 ай бұрын

Good explanation.....my teacher doesn't know how to teach......thank you for your service....may good things come to you....bless you

@ambikanath2918 4 жыл бұрын

Tysm u r such a good teacher u r doing an awesome job

@juniorcyans2988 Жыл бұрын

I learned from my professor how to use right hand rule to find the direction of F, B, and v. I struggled a while as you arranged y and x arises differently. Finally I realized that what I learned is still right.

@losvegas2569 Жыл бұрын

for some reason, ur voice is healing

@mr.unwonted4947 Жыл бұрын

It's so good and specially in simple words, I am a Physics student and I'm learning it for my Modern Physics part

@bamideledavid3372 3 жыл бұрын

This guy has a video on EVERYTHING Physics and Chemistry

@emekaekwuedivinesomtochukwu Жыл бұрын

I must confess that this video is loaded 💯👏👏

@Debbie-wg1ht Ай бұрын

I love you so much, I do not know what I would do without you😭

@Aaron-ji2yg 4 жыл бұрын

nice video its help me alot on chemistry :)

@DeptaGoOn 2 жыл бұрын

Thank you for your clarification. This has unlocked my brain from freezing.

@fadeyibimayowa1021 2 жыл бұрын

Master you're amazing, you're a God sent

@rock24039 4 жыл бұрын

Please make a video on how to follow your videos to complete organic chemistry topic wise.

@mponchanok Жыл бұрын

Thank you so much!!

@user-dz3qt6bf7l 3 жыл бұрын

Thank you so much you are the best

@elisabettanatuzzi4287 3 жыл бұрын

I can only say: “thank you”.

@henrikl...1264 2 жыл бұрын

Very good thank you

@adamraiyan 3 жыл бұрын

Thank you !

@eunicekibui4472 3 ай бұрын

This is completely awesome. thanks ❤uuuuu

@kasra38s 3 жыл бұрын

You’re a hero 😍❤️❤️❤️

@ayaaymankhttab Жыл бұрын

Thanks for teaching me what my teachers in egypt failed to.

@henrykoufie9142 10 ай бұрын

Good job 👏

@heaven3706 4 жыл бұрын

thank you!!!

@JohnSm3847 5 ай бұрын

Thank you

@shipurmohammed4764 4 жыл бұрын

JJ THOMPSON

@fantulemma 9 ай бұрын

respect JJ Thomson

@nachiketnalamati564 4 жыл бұрын

Thank you 😭

@jullietlamina2125 2 жыл бұрын

Nice video❤️. Can you please make a video for the oil drop experiment

@192ali1 10 ай бұрын

Excellent demonstration. what happens if positive and negative terminals of the battery were swapped?

@imanadil5849 4 жыл бұрын

kinda upset that this was posted after my exam :(

@jordanfindlay625 4 жыл бұрын

Life saver

@dr.basmaelhamali9269 2 жыл бұрын

Could you please explain CRO cathode Ray oscilloscope....it would be really helpful ..thanks

@philoso377 Ай бұрын

Nice video and presentation. Page 3:40 acknowledging that charge plate affect the beam from moving straight. But wouldn’t the glass tube wall blocks electric field of the plate? If not why not?

@skywalkeRRRR893 4 жыл бұрын

U teach better than my irl teacher

@kasra38s 3 жыл бұрын

*than all of the viewers, otherwise, we wouldn’t be here! :)

@AbbasKhan-me1gi 2 жыл бұрын

why did he use right hand rule, he was supposed to use left hand rule for getting the direction of the force. Right hand is used for the direction of induced current, innit?

@josephquaye937 2 жыл бұрын

God richly bless you. Wish to meet you one day.

@joefanningartist 3 жыл бұрын

Does this mean that also using this experiment, one could conclude which is the positive and negative side of a magnet?

@naveensingh5787 Жыл бұрын

the electron source was metal plates or ionisation of gas taken in the tube?

@philoso377 Ай бұрын

Page 5:00 I didn’t notice that the experiment test with insulation materials other than various metals, how can we conclude all materials possess and can emits electrons?

@shwethashetty306 4 жыл бұрын

In14.38 thumb should be at left as we take current on opp direction. To flow of electron

@ollymclure2143 4 жыл бұрын

This rule is for moving particles in magnetic field. Your thumb points in the direction of the moving particle regardless of charge. Just remember when you do this with a positive charge the force comes out of your palm but withe a negative charge it comes out the back of your hand.

@science-y9209 4 жыл бұрын

Yup youre right..

@al-aehel7766 Жыл бұрын

-NOTE-1 How did jj Thomson know that the ray consist from negative charge? 4:23 1)Due to the fact that it was deflect towards the positively charged plate 2)the fact that all different materials can emit a cathode ray helped him conclude that all atoms(materials) contain negatively charade particles -NOTE-2 Q= why is the ray green glow ? Bc the chamber is coated with a phosphor materials known as zinc-sulfide so when the electrons strike the glass they creat this characteristic green glow -NOTE-3 Describe the experiment Inside an evacuated chamber The prussue is very very low Also we have cathode (negativly chared electrod) and Anod (positivly chard electrod) Next When the caothod is heated by any heating element And if there a high voltage applied between c and a An electron beam is going to emanate (from the c towards the a and the a accelerate the ray towards the right)

@sadhusaisrujan3031 2 жыл бұрын

Super

@rabihk6872 7 ай бұрын

At 7:07 shouldnt the magnetic force exerted on the electron be downwards instead of upwards? Using RHR, taking your thumb to the right and your fingers outwards( toward you) , the palm of your hand will be facing downwards( the magnetic force).

@rishi7573 3 ай бұрын

I want to meet you in person you have the answers to all my problems I wish I could give you something

@mohamedkanneh9608 2 жыл бұрын

Cathode rays tube are a stream of negatively charged particles (corpuscles) later know as electrons how does it happen.

@botany-rp9zg 13 күн бұрын

i have question In cathode ray experiment there was used an electric field, so how was it determined which metal is + or - charged if the charge is determined by electrons and it wasn't yet discovered same goes with the voltage before discovring elctrons how was it determined which + or -

@ohayogozaimasusensei5551 2 жыл бұрын

16:56 Why is the electron moving in the upward direction considering the force for negative charge is downward. Shouldn't it move in a circle in the downward? Or I missed smth?

@patrickfiset1694 2 жыл бұрын

I too have this question.

@patrickfiset1694 2 жыл бұрын

My answer gets deleted, so I'll try once more in next comment

@patrickfiset1694 2 жыл бұрын

He applies the material once the electric and magnetic force are balanced. Then the electron are affected by the magnetic force, and (I think) CIRCLES starting downward. But maybe the circle-motion, being perpendicular, have nothing to do with the curve going up, so I think the magnetic force, the only force left, attracts the electron to the north plate that might be a positively-charged material.

2 жыл бұрын

i want to ask something. is this experiment electrolytic or galvanic cell? sorry, if I ask a dumb question.

@adityakailash8391 4 жыл бұрын

If there is more pressure in the tube I theorise it would be fine because electrons are subatomic particles they can pass through gas particles in the tube

@yjstylz2673 3 жыл бұрын

No bro , the reason why pressure is this low is that there can't be any other gas particles left otherwise u won't any fine beam emanating from cathode . Moreover, any subatomic particle can't just pass through another atom whether they are matter-particle fermions or force-carriers bosons .

@bebrownbear8354 Жыл бұрын

I dont understand why Fm can make cathode ray opposite Fe?

@shwethashetty306 4 жыл бұрын

Thanks man but how do you cAlculate magnetic force

@nellvincervantes3223 4 жыл бұрын

Magnetic force = charge* cross product of velocity and magnetic field

@philopateerzaki5016 3 жыл бұрын

About how much I love u ❤

@annikavashist448 3 жыл бұрын

How is it that the since the magnetic force provides the centripetal force, it's equal?

@vikrantsingh4504 3 жыл бұрын

because the magnetic force is a centripetal force i.e. the centripetal force on its own is not a force(centripetal force is not a part of four fundamental forces it is a category fo forces which acts in a circular way)

@averagedoggosenjoyer2897 3 жыл бұрын

@@vikrantsingh4504 +1

@sagemaster3408 Жыл бұрын

Because the magnetic force IS the centripetal force. Basically the magnetic force causes the centripetal. Therefore it’s equal. Remember that “centripetal force “ is basically explaining what the original force is doing So if the original force is the magnet Therefore, the centripetal would have same value .

@qwerty0202 3 жыл бұрын

In ncert text deflection of electron in the presence of B is given just opposite?

@ruiiios Жыл бұрын

????

@gayatrid2748 2 ай бұрын

How do we calculate radius of curvature?

@chancetshimanga3727 Жыл бұрын

not all heroes wear capes 👑

@ryanchen2341 10 ай бұрын

i love you dad, pls come back

@judyimali6677 4 жыл бұрын

What about the grid system

@DANIELDALLAS_MATHs 4 жыл бұрын

If U mean about Grid as a third electrode that carries the duty of handle the electron stream, there is no a single word about. But you can apply superposition principle to figure out the effect it has on the stream

@navieats3955 4 жыл бұрын

dope

@THEIMRANACADEMY 3 жыл бұрын

⭐⭐⭐⭐⭐⭐

@MegaGiannisz 3 жыл бұрын

So two questions I can't seem to get an answer to. Firstly, how was he able to realise which plate is positively and which was negatively charged since those values until deeper levels (quantum physics) are purely arbitrary. Secondly, since the direction of the magnetic field does not change direction how does the electron move in a circle? What am I not understanding here? It is clear to me that velocity changes direction so the x product of v and B will have a different value. And intuitively as well, shouldnt the ray be deflected until its velocity is only towards the z axis? How does the magnetic force keep it's centripetal character even though the magnetic field is uniform in a single direction?

@fatimalearns9618 3 жыл бұрын

Did you get an answer to your questions?

@ashrayakochara2291 3 жыл бұрын

yes im so confused about the whole anode cathode thing

@JSvideos576 2 жыл бұрын

One thing he glosses over is that the equation is actually F=qv x B. The magnetic field produces a Lorentz force that is perpendicular to both the velocity vector and the magnetic field. It only reduces to qvB when the cross product is 1 (angle is 90 degrees so sin(theta)=1, and B field is perpendicular to velocity). As the particle changes direction the uniform magnetic field is still constantly producing a force perpendicular to the velocity vector. In this case it's the same concept as centripetal force. For circular motion with uniform velocity the force is perpendicular and toward the center of the circle. So I guess for the second question, yes the magnetic field is not changing direction, but the force is because the particle is changing direction and this is built in to the equation with the cross product.

@JSvideos576 2 жыл бұрын

I see what you are saying now, as you already mentioned the cross product. For it to make sense you really have to visualize this in 3 dimensions. Otherwise, you might come to the conclusion that deflection would stop at a certain point. The particle is never moving in the same direction as the magnetic field since they are in completely different planes.

@samalger3336 2 жыл бұрын

Hey dude how does r^2=q/m

@sefalibhakat143 4 жыл бұрын

Why cathod ray not collide with the anode???

@tanishqkhurana8721 4 жыл бұрын

Anode tube had a hole in it

@yuvrajkhater2227 4 жыл бұрын

It’s perforated

@tanhrs8711 2 ай бұрын

Why is the trajectory a circle and not a parabola ?

@williamscott1516 2 ай бұрын

Bc the (magnetic) force is perpendicular to the electron's velocity (right hand rule). I'm guessing your confused bc idk for example if you throw a ball (constant grav force) its trajectory is parabolic, thing is tho, if you were to yeet a ball fast enough that 1 the gravitational force is perpendicular to its motion and 2 it stays perpendicular to its motion, it would also be a circular trajectory. (I think)

@tanhrs8711 2 ай бұрын

@@williamscott1516thank you for the explaining. It was actually very clear !

@user-wg3le6qo2h 9 ай бұрын

See another

@whoisanjaia Жыл бұрын

He lost me when he started talking abt Physics

@user-ur6uw6vn9t 15 күн бұрын

You mean when the video started?

@JamieDiseker Ай бұрын

This is why Tesla never got his death ray built. I guarantee it has something to do with getting the death built, just saying I was the first to say the cathode ray / Death Ray.....might have had some technical similar condition

@ajricherson1099 4 жыл бұрын

According to the right hand rule, shouldn't the force at 8:26 be directed downward? Is it opposite because the electron has a negative charge?

@ajricherson1099 4 жыл бұрын

Nvm, I looked in my physics book, and it is indeed flipped because of the negative charge.

@teresamartins9277 Жыл бұрын

@@ajricherson1099explain plzzzz

@Eclipse-qo9pw 9 күн бұрын

I don’t know why in the world are people using right hand thumb rule for this we would not apply RHR because it gives the direction in which the particle would deviate due to electric field but we need to find the direction of deviation due to magnetic field for a moving charge so we will use the LHR

@harrig2403 4 жыл бұрын

you sound like mark wahlberg

@samblehhhhh 9 ай бұрын

I see

@nhatduong1534 2 жыл бұрын

Mass of electron should be 9.11*10^-31kg

@georgesadler7830 6 ай бұрын

He converted the mass of an electron to grams which is correct.

@camilamolina499 4 жыл бұрын

What exactly is an electrode?

@Vedant.Dhawan 4 жыл бұрын

U dumb

@kasra38s 3 жыл бұрын

@@Vedant.Dhawan 😒😒

@Vedant.Dhawan 3 жыл бұрын

@@kasra38s what?

@kasra38s 3 жыл бұрын

@@Vedant.Dhawan don’t be toxic

@reg3250 4 жыл бұрын

Excuse me professor may I go to the comfort room?

@AvaMaina Ай бұрын

use better grafix

@paulhetherington3854 Жыл бұрын

Hence; create special - LED leads - tits - console. And it's all, video game intel.

@IsaacAwad.04 2 жыл бұрын

How many subs dies he was ?

@Arnal_2075 27 күн бұрын

Class 11th students 😢

@arsei8389 11 ай бұрын

6:51 I've been struggling with the directions of the magnetic field, magnetic force, and velocity of the charge for two weeks and it turns out that I was using the direction of velocity of a positive charge while studying about ELECTRONS😐🥲